Release stranded synchronized terminal output

src/bin/dosh-client.rs

@@ -10290,6 +10290,7 @@ fn render_frame_bytes(frame: &Frame) -> Vec<u8> {
 }
 
 const TERMINAL_SNAPSHOT_RESET: &[u8] = concat!(
+    "\x1b[?2026l",
     "\x1b[0m",
     "\x1b[?25h",
     "\x1b[?1003l",
@@ -10741,6 +10742,7 @@ impl Drop for RawMode {
 }
 
 const TERMINAL_CLEANUP: &[u8] = concat!(
+    "\x1b[?2026l",
     "\x1b[?1l",
     "\x1b[0m",
     "\x1b[?25h",
@@ -11707,6 +11709,10 @@ mod tests {
         let bytes = render_frame_bytes(&frame);
 
         assert!(bytes.starts_with(TERMINAL_SNAPSHOT_RESET));
+        assert!(
+            bytes.starts_with(b"\x1b[?2026l"),
+            "a reconnect snapshot must release a stranded synchronized-output update first"
+        );
         assert!(bytes.ends_with(b"frame-7"));
     }
 
@@ -11899,6 +11905,12 @@ mod tests {
         assert!(TERMINAL_CLEANUP.windows(8).any(|w| w == b"\x1b[?1016l"));
     }
 
+    #[test]
+    fn terminal_resets_release_synchronized_output_before_other_cleanup() {
+        assert!(TERMINAL_SNAPSHOT_RESET.starts_with(b"\x1b[?2026l"));
+        assert!(TERMINAL_CLEANUP.starts_with(b"\x1b[?2026l"));
+    }
+
     #[test]
     fn unowned_mouse_reports_are_stripped_unless_tui_owns_mouse() {
         assert!(should_strip_unowned_terminal_reports(false, false));